Lifting-jack.



- N0. 761,914. I PATENTED JUNE 7, 1904;

1 G. RIGGS,

LIFTING JACK.

N0 MODEL.

A TTOHNEY me nomas PETERS co. FHQYQLITHO., wAsrImYoN, D. c.

' `UNITED STATES :Patented June 7, 1904.

PATENT OEEICE.

GLADSTONE RIGGS, OF BOTHELLVWASHINGTON, ASSIGNOR OF ONE-HALF TO O. C. SILL, OF BOTHELL, VASHINGTON.

LlFTme-JACK.

SPECIFICATION forming part of Letters Patent No. 761,914, dated June '7, 1904. Application filed Tune 24, 190,3. Serial No. 162,951. (No model.)

To LZ/f whom, t may concern:

Be it known that I, GLADsToNE Rises, a citizen of the United States of America, and a resivice of this nature in which the application of the power can be varied for a light or heavy lift. y x y Among numerous objects attained by this invention and readily understood from the following specification and accompanying drawings, included as a part thereof, is the production of a simplified and eflicient lifting-jack embodying essential features of adjustability and utility throughout the operating mechanism, which allows for a variable application of the power to the lifting-bar and facilitates the operation-thereof. e

The above-mentioned and other desirable objects are attained by the constructions, combinations, and arrangements of parts as disclosed on the drawings, set forth. in this speciiication, 'and'succinctly pointed out in the appended claims.

With reference to the drawings filed herewith and bearing like reference characters for corresponding parts throughout, Figure 1 is a side view of the lifting-jaclnwith the standard, shown in longitudinal section, and the adjustable lever, shown by bold lines engaged with the lifting-bar and by broken lines engaged with the power-multiplying mechanism; andFig. 2 is a plan viewof-the liftingjack, with the standard, shown in horizontal j mechanism.

section on line 2 2 of Fig. 1, and the adjustable lever engaged with the power multiplying This invention includes a suitable support as a vertical standard 3, which is formed tubu- `lar and comprises a cylindrical section 4, ro-

per end lconsisting of opposite side pieces 7,

preferably formed integral with the standard, which is cut away between these side pieces at suitable pointsto allow for engagement of the power-multiplying mechanism and check-pawl with the lifting-bar and is formed with a longitudinally-extending slot 8 in the wall opposite to said bracket. The lower end of this standard is formed with a head and fits freely within an annular iange 5', formed on base 5, and a bolt 6 is engaged in suitable corresponding apertures in said head and base and serves to hold the base to the standard when the jack is raised from the ground.

Fitting in the bore of standard 3 is a longitudinally-movablelifting-bar 9, which is provided with rack-teeth 10 along one side of the periphery, and at the lower end of this bar 0pposite the teeth is secured a laterally-projecting spur 12, which lits slidably in slot 8 and is curved upwardly at the outer extremity and sharpened at the end, so that the spur will readily-bite into logs or timbers resting on '70 fiat planes for the purpose of lifting them at the ends, for example, so that skids or blocks can be readily placed beneath them.

Operatively connected with lifting-bar 9 is power-multiplying `mechanism comprising a train of spur-gears, which includes a powerpinion 11, engaged with teeth 10 and secured to a spindle 14, rotatably supported in suitable apertures formed in side pieces 7, and to one end of this spindle is secured an intermediate spur-wheel 15, which 'is located at one side of bracket 6 and meshes with an intermediate spu-r-pinion 16, secured 'to a spindle 17, rotatably supported in suitable apertures formed in side pieces 7 and carrying a iXedl ymounted driverl 18 intermediate said side pieces consisting of a spur-gear. j

Reference character 19 indicates a toothed member for operating the lifting-bar and includes a lever, which is adjustably mounted relatively to the lifting-barA and the driver of the power-multiplying mechanism and carries a gear-sector 20 at theload end of suitable pitch to'mesh withthe teeth on said bar or -the teeth on said driver. r1`his lever is 95 fulcrumed )on an adjustable carrier 21, on

which the fulerum-pin 22 for the lever is mounted and which comprises opposite links movably mounted between side pieces 7 on'a pivot 23, seated on said side pieces adjacent their outer upper corners, and these links carry the fulcrum-pin 22 adjacent their free ends and embrace said lever.

Adjacent the lower edge of bracket 6 is a spring-pressed catch-pawl 24, which is formed with two fingers 25, spaced apart in accordance with the pitch of teeth l() and beveled at their lower outer corners, so as to ride said teeth as the lifting-bar is moved outwardl y. This pawl is suitablyr slidably mounted on a shelf, as 26, and is pressed by a spring, as 27, arranged to yieldingly hold the pawl in engagement with said teeth, and a trip 28, consisting' of a transversely-disposed horizontal bar, is engaged with the head of said pawl and slidably fits in suitable elongated slots 7 formed in side pieces 7, and is formed with a suitable finger-piece 29, by means of which the pawl is moved outwardly to disengage it from the teeth l0 when desired to drop the lifting-bar.

By adjustably mounting the operating-lever it can be shifted relatively to the liftingbar or driver of the power-multiplying mechanism so that the lifting-bar can be operated for light loads or quick outward adjustment by applying the lever thereto direct, and when desired to raise a comparatively heavy load the lever can be applied to the driver of the power-multiplying mechanism, while the spur on the lifting-bar renders the device useful in lifting logs, as before described, and by rotatably mounting' the standard on the base it can be turned when the spur is so engaged to advance the lifted end of the timber or log.

The operation of the jack will be readily understood from the foregoing description and accompanying drawings; but, briefly stated, it would be as follows: When desired to lift a light load or adjust the lifting-bar outwardly, the carrier 21 is swung upwardly to bring the gear-sector of the operating-lever into engagement with the teeth on the said bar, and the lever is then operated to raise the lifting-bar, and to clear the levers from said teeth for return it is simply necessary to swing said carrier outwardly a slight distance. I/Vhen a heayy load is to be lifted, the carrier is swung outwardly to bring the lever into operative relation to the driver of the power-multiplying mechanism, when it is operated as before to drive said mechanism.

This lifting-jack is simple and inexpensive of construction and durable in use and possesses marked advantages of adjustment, which greatly facilitates the work of lifting, as it permits of direct application of the lever for quick movement of the lifting-bar in light work and the application of the lever through power multiplying mechanism for heavy work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States of America, is

l. In a lifting-jack; the combination of a toothed lifting-bar, power-multiplying mechanism operatively related to said bar, and a shiftable lever adapted for either direct engagement with the teeth on said bar or for engagement with said mechanism.

2. In a lifting-jack; the combination of a toothed lifting-bar, power-multipl ving mechanism including a gear engaging with the teeth on said bar, and a lever adjustable f'or engagement with the teeth on said lbar or with said mechanism.

3. In a lifting-jack; the combination of a toothed lifting-bar, a train of gears opera.- tively connected with the teeth on said bar, and a toothed member adjustably mounted for engagement with said bar or with the drivinggear of said train.

4. In a lifting-jack; the combination o1 a toothed lifting-bar, a train of gears one of which meshes with the teeth on said bar, a catch-pawl related to said bar, and a toothed lever adjustable for engagement with said bar or with the driving-gear of said train.

5. In a lifting-jack; the combination of a toothed lifting-bar, a train of gears one of which meshes with the teeth on said bar, and

`a lever carrying a gear-segment and adjustably mounted for engagement of said segment with the teeth on said bar or with the d rivinggear of said train.

6. In a lifting-jack; the combination of a toothed lifting-bar, a train of gears one of which meshes with the teeth on said bar, a carrier adjustable relatively to said bar and the driving-gear of said train, and a lever fulcrumed on said carrier.

7. In a lifting-jack; the combination of a toothed lifting-bar, a train of gears one of' which meshes with the teeth on said bar, a carrier adjustable relatively to said bar and the driving-gear of said train and comprising pivotally-mounted links, afulcrum-pin on said links,and a lever carrying a gear-sector mon n ted on said pin.

8. In a lifting-jack; the combination of a toothed lifting-bar, a rotatably-mounted spindle, a power-gear meshing with the teeth on said bar and fixed to said spindle, an inte'rmediate wheel fixed to said spindle, a second rotatably-mounted spindle, a pinion meshing with said wheel and fixed to said second spindle, a driving-gear fixed on said second spindle, a carrier adjustable relatively to said bar andthe driving-gear of said train and comprising pivotally-mounted links, a fulcrun'ipin on said links, and a lever carrying a gearsector mounted on said pin.

9. In a lifting-jack; a base, a tubular standlOC/ IOS

ard rotatably mounted on said base and having a longitudinally-extending slot in the wall, a lifting-bar iitting in the bore of said standard, and a spur secured to said bar at the lower end and projecting from said slot.

10. A standard havinga bracket at the upper end comprising opposite laterally-projecting side pieces, a\toothed lifting-bar litting in -ond spindle between said side pieces, a carrier comprising opposite links pivotally mounted on said bracket, a fulcrum-pin on said links, a lever mounted on said pin and carrying a gear-sector, anda spring-pressed catch-pawl mounted on said standard and normally engaging with the teeth on said base.

ll. In a lifting-jack; a standard, a toothed lifting-bar slidably mounted on said standard and having opposite laterally-projecting side pieces formed Vwith corresponding outwardlyextending slots, a horizontally disposed spring-pressed catch-pawl slidably mounted between'said side pieces and having lingers beveled at their lower .outer corners and spaced apart in conformity with the pitch of the teeth on said standard, and a trip comprising a transversely-disposed vbar connected with said pawl andslidably mounted in said slots and having a finger-piece at one end.

Signed at Seattle,Washington, this 4th day of June, 1903.

GLADSTONE RIGGS.

Witnesses:

W. PARRY SMITH, THOMAS KELLEY. 

